And he answered her: Go. And he sent her away for two months. And when she was gone with her comrades and companions, she mourned her virginity in the mountains.

“That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite,.... Either the death of her, as some, or her virginity, as others; though the word (p) used may signify to talk and discourse with her, to hold a confabulation with her, and comfort her, as Kimchi and Ben Melech interpret it; to bring her some news, and tell her some diverting stories, to cheer and refresh her in her solitude. De Dieu observes, that the word signifies in the Arabic language to "praise", or speak in commendation of a person or thing; and indeed in this sense it seems to be used in this book, Jdg 5:11, "they shall rehearse", that is, with praise and thanksgiving, "the righteous acts of the Lord"; and so the daughters of Israel went every year to the place where the daughter of Jephthah was, to speak in the praise of her, of her heroism, in so cheerfully submitting to her father's vow, and expressing such gratitude and joy at the same time for victory over the enemies of Israel; and this they did in her presence and while she lived, to keep up her spirits; or it may be, in some public place, and even after her death, in memory of her, and to celebrate her praise. Epiphanius says (q), that in his time, at Sebaste, formerly called Samaria, they deified the daughter of Jephthah, and kept a feast for her every year. The meeting of the daughters of Israel, so long as the custom lasted, which perhaps was only during the life of Jephthah's daughter, was four days in a year; but whether they were four days running, or once in a quarter of a year, is not certain; the latter seems most probable. (p) "ad alloquendum", Pagninus, Montanus; "ut dissererent", Tigurine version; "ut colloquerentur", Vatablus; "ad confabulandum", Junius & Tremellius, Piscator. (q) Contr. Haeres. l. 2. Haeres. 55. Next: Judges Chapter 12”

“And I will bewail, etc. And he did to her, etc. A chaste virgin, that is, the Church, etc., up to on account of which also two testaments are spoken of. From that time the custom grew. But as to what was done by ordinance in Israel, that from days to days they came together to lament the daughter of Jephte, four days in the year, I do not think it signifies anything after the holocaust is fulfilled, which will be in eternal life, but the past times of the Church, in which were the blessed that mourn. By the four days her universality was figured, on account of the four parts of the world through which she is spread far and wide. But as to the proper sense of the history, I do not think the Israelites decreed this except because they understood that in her the judgement of God had been shown rather for the striking of the father, lest anyone thereafter should vow such a sacrifice. For why was a lamentation decreed, if that vow is a matter of gladness?”